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Calculations are based on optimum and planned step climbs and cruise altitudes.
10 Optimum Altitude and Maximum Altitude (OPT, MAX)
OPT –
• displays altitude which minimizes trip cost when ECON speed selected
• displays altitude which minimizes trip fuel when LRC or SEL speed
selected
MAX – displays the maximum cruise altitude based on:
• current gross weight
• number of engines operating
• selected speed option
• disregarding any altitude or speed constraints
• residual rate of climb set by airline (range: 0 to 500 feet per minute;
default is 100)
11 Engine Out (ENG OUT)
Push –
• displays E/O CRZ page
• commands engine out performance calculations
• changes CRZ ALT if above maximum engine out altitude
• changes command speed to engine out LRC speed
• upon execution, reference thrust limit changes to CON
12 Long Range Cruise (LRC)
Push – displays LRC CRZ page.
Engine Out Cruise
Engine out (E/O) VNAV cruise guidance displays on E/O CRZ page. E/O CRZ
page must be selected and executed by the flight crew. Engine out data is also
available with all engines operating.
EO Cruise Page
The modified page displays engine out performance limitations based on one or
two engines out. Manual entries are allowed. When above the maximum engine
out cruise altitude, VNAV calculates engine out guidance for drift down (D/D).
The E/O LRC (long range cruise) D/D page changes to the E/O LRC CRZ page
when reaching the engine out cruise altitude.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.42.6 D6-30151-425
Flight Management, Navigation -
FMC Cruise
As the airplane gross weight decreases, maximum altitude increases. A step climb
may be possible under these conditions.
The following example uses a cruise altitude above the maximum engine out
altitude.
1 Page Title
The page title displays active (ACT) and modified (MOD) cruise.
Page titles include:
• E/O - minimum drag speed
• E/O LIM SPD - speed based on airplane configuration limiting speed
• E/O MCP SPD - MCP speed intervention selected
• E/O XXXKT - fixed CAS descent speed
• E/O M.XXX - fixed Mach descent speed
• E/O LRC D/D - airplane is above MAX altitude
• E/O LRC - airplane is level at CRZ ALT; less than MAX
• E/O CRZ CLB/DES - cruise climbs or descents when the CRZ ALT is
below MAX altitude
4 4 0
9 1 . 3 %
N 1
- -- - - - - -- --- -- --- -- ---
/
C R Z A L T
L
ALL E NG>
3
- -
A CT E/O L RC CR Z 2
L R C S P D
72 3
S T E P S I Z E
CA O
< E/ O
2 61
S PD
S T E P T O
FL
A T
0 N M
K A T L E T A / F U E
2 Z / 6 5 . 2
2 Z
34 4
L
M A X
/
O P T
2 1
F L2 54 FL 261
F
.
I
280
ENG OUT>
XXXX CRZ
2
3
4
5
6
7
8
1
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.42.7
2 Cruise Altitude (CRZ ALT)
Displays altitude from MAX ALT line when current CRZ ALT above MAX ALT.
Displays CRZ ALT from all engine cruise page if ENG OUT executed prior to
engine shutdown.
Valid entries are the same as all engine cruise page.
3 Long Range Cruise Speed (LRC SPD)
Displays computed engine out LRC speed.
Valid entries are the same as all engine cruise page.
SEL SPD - displays when flight crew enters speed.
E/O SPD - displays when E/O SPD prompt selected.
Manual entries may change MAX altitude.
4 Engine Out (EO SPD)
Push – enables execution of engine out minimum drag speed profile.
Displays when LRC or SEL SPD is the active speed mode.
5 AT
Same as all engine display.
Displays time and distance to reach cruise altitude during driftdown.
6 Optimum Altitude and Maximum Altitude (OPT, MAX)
OPT - displays optimum altitude at speed displayed on speed line.
MAX - displays the maximum cruise altitude based on the same parameters as
MAX for all engines.
7 ALL Engine (ENG)
Push – displays and enables execution ofMOD XXX CRZ page with performance
based on all engines operating.
8 Long Range Cruise (LRC)
Push – enables execution of engine out long range cruise.
Displays when EO or SEL SPD is the active mode.
December 01, 1999
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波音747-441操作手册2(90)
